Reality vs Games: Soldiers usually don't use knifes in combat :). They train for it, but this happens only in games and movies, in RL it is way too unsafe to try to kill someone that way... We will show some variants of combat knifes here. Video games usualy call it a knife, sometimes it might have a fiction name. Real Military or Special Operations knifes are pretty expensive, as they have some very special features: The blade is black and even hard use won't take away the black color The blade is strong enough that you can crank crates, doors or windows with it It has to be very light The sheath is not allowed to make any sound even when running Exmaple: Battlefield Bad Company 2: KNV-1

Pure fictional thing from Battlefield Bad Company 2. In real battles targets are marked with infra red lasers. You can find a picture of a laser designator here: http://www.realshooter.eu/index.php/bombs/249-laser-guided-bomb/view-details.html